Wordnet 3.0
NOUN (1)
1. 
 any of various wild bovines especially of the genera Bos or closely related Bibos; 
[syn: ox, wild ox]
WordNet (r) 3.0 (2006):
wild ox
    n 1: any of various wild bovines especially of the genera Bos or
         closely related Bibos [syn: ox, wild ox]